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OK, thanks. Double Pawn pushes were of course standard in Fairy-Max, so this is easy to do. Any simple move can in fact be defined as initial move on a piece, but the problems arise when a multiply-pushed Pawn can be e.p. captured on more than one square, because Fairy-Max keeps only a single e.p. square as part of the game state. But I have added some code that would make that possible for the special case of 10-rank boards and straight-ahead triple pushing. It seems that Mexican Chess has that. And Wildebeest Chess, but that then has the extra complication of still allowing a normal double-push from 3rd rank. While Fairy-Max does not enable initial moves by board location, but by whether the piece has moved before. (Which for Kings and Rooks is the proper thing to do, and for Pawns normally doesn't make a difference, because of their irreversibility.) I built in a kludge now to define an initial triple-push that turns into a double-push on 3rd rank. Still, Wildebeest Chess is a strange beast, and I am still choking on castlings where the King steps one square, as this creates an ambiguity in move encoding. Anyway, Roman Chess seems the perfect example of a no-frills not-too-unimaginative 10x10 Chess variant.